package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumnation.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointcut() {
    }

    /**
     * 通过反射获得操作相关的信息
     *
     * @param joinPoint
     */
    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException {

        log.info("开始持久层代码公共字段的自动填充:");

        //获取当前被拦截方法的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获得被拦截方法的实体类参数
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) return;
        Object entity = args[0];

        //获取赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        if (OperationType.INSERT.equals(operationType)) {
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                setCreateTime.invoke(entity, now);
                setUpdateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateUser.invoke(entity, currentId);

            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (OperationType.UPDATE.equals(operationType)) {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
}
